Scrapely

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- Update C extensions generated from Cython for python 3.7
- Fix PEP8 violations

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- Improved price extraction
- Replaced deprecated functions

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- Use 64 bit integers when matching pages

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- Add python3 support for `url_to_page` function

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- Remove numpy as a mandatory import in setup.py

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- Python 3 support;
- fixed incorrect webpage encoding detection;
- usability improvements for scrapely.tool;
- internal cleanups;
- number extractor now supports numbers with a sign.
- add C extension to speed up parsing and extraction